Fire extinguisher



FIG. 1 a front perspective view of a fire extinguisher showing my new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof; and

FIG. 4 is a top plan view thereof.

The undisclosed rear is flat and unornamental. 

The ornamental design for a fire extinguisher, as shown and described. 